26
Abandoned masonry
used as raceway
(per code)
12 in. min. from
overhang or roof
Maintain 12 in.
minimum clearance
above highest anticipated
snow level or grade
whichever is greater.
Side wall termination
with 2 elbows (preferred)
12 in. min. from
overhang or roof
Maintain 12 in.
minimum clearance
above highest anticipated
snow level or grade
whichever is greater
6 in. minimum clearance
between wall and end of vent pipe.
10 in. maximum pipe length
Sidewall Termination
with Straight Pipe (preferred)
Roof Termination (Preferred)
Vent
Maintain 12 in.
minimum clearance
above highest anticipated
snow level maximum of
24 in. above roof.
90
°
A05091
Fig. 32
---
Vent Pipe Termination for Ventilated Combustion Air (1--pipe) System (All Sizes)
TABLE 6—VENT TERMINATION KIT FOR DIRECT VENT/2--PIPE SYSTEM
DIRECT VENT (2---PIPE) TERMINATION KIT
TERMINATION SYSTEM
DIAM. OF COMBUSTION AIR AND VENT
PIPES (IN INCHES)
2---in. Concentric Vent Kit
Single Penetration of Wall or Roof
1, 1---1/2, 2, or 2---1/2
3---in. Concentric Vent Kit
Single Penetration of Wall or Roof
2---1/2, 3
2---in. Termination Bracket Kit
2---Pipe Termination System
1, 1---1/2 or 2
3---in. Termination Bracket Kit
2---Pipe Termination System
2---1/2, 3
TABLE 7—MAXIMUM ALLOWABLE EXPOSED VENT PIPE LENGTH (FT) WITH INSULATION IN WINTER DESIGN
TEMPERATURE AMBIENT*
UNIT SIZE
WINTER DESIGN
TEMPERATURE (
°
F)
MAXIMUM PIPE
DIAMETER (IN.)
INSULATION THICKNESS (IN.)†
0
3/8
1/2
3/4
1
060---14
20
2
30
55
61
70
70
0
2
16
33
38
46
53
---20
2
9
23
26
33
38
080---14
080---20
20
2
37
65
70
70
70
0
2
20
39
45
55
63
---20
2
11
27
31
39
45
100---20
20
2---1/2
41
70
70
70
70
0
2---1/2
21
42
48
59
68
---20
2---1/2
11
28
33
41
49
120---20
20
3
49
70
70
70
70
0
3
26
51
58
70
70
---20
3
15
35
40
50
59
* Pipe length (ft) specified for maximum pipe lengths located in unconditioned spaces. Pipes located in unconditioned space cannot exceed total allowable pipe
length as specified in Table 6.
{
Insulation thickness based on R value of 3.5 per in.
NOTE
: Combustion air pipe must have the same diameter as
vent pipe.
Concentric Vent/Combustion Air Termination Kit (Direct
Vent/2--Pipe System Only)
Determine an appropriate location for termination kit using the
guidelines provided in section “Vent Termination: General” in
this instruction.
1. Cut one 4--in. diameter hole for 2--in. kit, or one 5--in.
diameter hole for 3--in. kit.
2. Loosely
assemble
concentric
vent/combustion
air
termination components together using instructions in kit.
3. Slide assembled kit with rain shield REMOVED through
hole.
NOTE
: Do not allow insulation or other materials to accumulate
inside of pipe assembly when installing it through hole.
58U
VB
